onsemi 1.5KE7.5AG

Overview

1.5KE7.5AG from ON Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) diode designed for parallel clamping protection of sensitive electronics. It features a 6.4 V working peak reverse voltage (VRWM), 7.5 V nominal breakdown voltage (VBR), 11.3 V clamping voltage (VC) at 132 A peak pulse current (IPP), and sub-1 ns response time - deployed in power supplies, industrial controls, and medical equipment to protect CMOS/MOS/Bipolar ICs from ESD and surge events.

For engineers reviewing the 1.5KE7.5AG datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system DC bus voltage, VC margin relative to IC absolute maximum ratings, UL 497B certification for isolated loop compliance, and axial lead (Case 41A) mechanical compatibility with through-hole PCB layouts.

Technical Context

The 1.5KE7.5AG operates as a unidirectional Zener-based TVS, leveraging avalanche breakdown to clamp transients above its VBR of 7.13–7.88 V (tested at 10 mA). Its low dynamic impedance and fast intrinsic response (<1 ns) enable effective suppression of ESD (Class 3, >16 kV HBM) and lightning-induced surges per IEC 61000-4-5.

Thermal design relies on junction-to-lead resistance (R_JL = 20 °C/W) and steady-state derating from 5.0 W at T_L ≤ 75 °C, with peak power limited to 1500 W for 1 ms non-repetitive pulses. The device uses Surmetic axial-leaded plastic packaging (Case 41A) with Pb-free finish and cathode band polarity marking.

Key Specifications

Pinout & Package

1.5KE7.5AG is housed in an axial-leaded Surmetic plastic package (Case 41A), with cathode identified by a colored band. Leads are tin-plated, solderable at 260 °C for 10 seconds at 1/16 inch from case body. Mounting orientation is unrestricted.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient suppression applications.

Compared with SMBJ7.0A, 1.5KE7.5AG delivers 2.5× higher surge power and axial-leaded reliability for high-vibration environments; versus 1N6267AG, it is functionally identical but reflects ON Semiconductor's updated part numbering convention - both share full pinout, thermal, and clamping behavior.

Availability

1.5KE7.5AG is available at Aetrix Electronics and suitable for industrial power supplies, medical instrumentation, communication interfaces, and business machine designs requiring stable component supply and long-term obsolescence management.

Supply support for 1.5KE7.5AG includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and medical markets.

The 1.5KE7.5AG belongs to the 1.5KE Series Mosorb TVS family - engineered specifically for high-power, axial-leaded transient suppression in safety-critical and high-reliability applications demanding UL 497B certification and robust surge immunity.

FAQ

What is the clamping voltage of the 1.5KE7.5AG and why does it matter?

The 1.5KE7.5AG has a maximum clamping voltage (VC) of 11.3 V at 132 A peak pulse current. This value defines the highest voltage imposed on the protected circuit during a surge event. It matters because downstream components - such as 5 V or 12 V regulators and microcontrollers - must withstand this clamped voltage without exceeding their absolute maximum ratings. A low VC relative to VBR (e.g., 11.3 V vs. 7.5 V nominal) indicates efficient energy diversion and minimal stress on the system.

Is the 1.5KE7.5AG RoHS-compliant and what does the "G" suffix indicate?

Yes, the 1.5KE7.5AG is RoHS-compliant. The "G" suffix explicitly denotes a Pb-free package per ON Semiconductor's environmental policy. This applies to both the lead finish and mold compound, meeting EU Directive 2011/65/EU requirements. The device retains full electrical and thermal performance while enabling compliance with global environmental regulations and facilitating lead-free soldering processes at 260 °C.

How does the 1.5KE7.5AG differ from bidirectional TVS diodes?

The 1.5KE7.5AG is unidirectional and functions only during reverse-bias overvoltage conditions - ideal for DC power rail protection where polarity is fixed. Bidirectional TVS diodes (e.g., 1.5KE7.5A) conduct in both directions and are used for AC lines or symmetric signal paths. Using 1.5KE7.5AG on a DC line avoids unnecessary leakage during normal forward bias and provides tighter clamping control than bidirectional equivalents with the same VRWM.

Can the 1.5KE7.5AG be used in place of a 1N6267AG?

Yes, the 1.5KE7.5AG is functionally and mechanically identical to the 1N6267AG - both share the same Case 41A axial package, electrical specifications (VRWM = 6.4 V, VBR = 7.13–7.88 V, VC = 11.3 V), and UL 497B certification. The 1N6267AG is the legacy JEDEC designation; 1.5KE7.5AG is ON Semiconductor's current preferred part number. No layout or schematic changes are required when substituting 1.5KE7.5AG for 1N6267AG.

What thermal considerations apply when mounting the 1.5KE7.5AG?

The 1.5KE7.5AG has a junction-to-lead thermal resistance (R_JL) of 20 °C/W and is rated for 5.0 W steady-state dissipation at lead temperature (T_L) ≤ 75 °C, derating linearly above that. To maintain reliability, ensure adequate copper pour on PCB pads, minimize lead length, and avoid enclosing the device in thermally insulating enclosures. For repeated surge events, average power must stay within derated limits per Figure 2 in the datasheet - sustained operation above T_L = 100 °C risks premature degradation of the 1.5KE7.5AG.